hull year id#?

just bought the v20, it'll be in my driveway with a new prop on tuesday for me to detail and drop in. the question is, the previous owner stated it was a 1973, but the model # on the hull reads WELB1455M791-V20. the "79" leads me to believe it is a '79, especially since that's what year the od and motor are. can anyone confirm or deny my assumptions?
i can't really tell from pictures what the differences are as far as hull layout and whatnot. there are two teak boxes in the deck side by side fore of the motor, and there are two hatches in the transom, if that helps anything. either way, i'm stoked about my new ride. thanks for the help.